First of all, don't let yourself take the blame for what HE did. Don't get caught up in why it happened, or why it happened to you.
One thing you can do is write it out. Write about how it made you feel, why it hurt you so much and what you think of him. At the end of your "letter" find a way to forgive yourself, even though it isn't your fault, you will eventually blame yourself, if you haven't already.
After you have written these things, find a safe place like a fireplace or BBQ and light that paper up! watch it burn and then blow the ashes away.
Like everything, it takes time to heal the hurt that has been created. It didn't just appear by magic and won't disappear that way either. If you pray, then ask God to take your pain, because he is better equipped to carry it than you are. And He and the angels are always happy to help.
I wish peace for you.